Data Source History:
The freeways were hand selected from the main "streets layer", along with on and off ramps. Only the major interstates were included in this layer; smaller road sized highways, such as Rtes. 185 and 61, were left out.

Quality Check:
This layer was a sub-set of the street centerline layer, and is as accurate as the streets centerlines. Freeways with 3-dimensional features such as overpasses and tunnels were field-checked from a flashy convertible sportscar by Jonathan Lowe and Kyle Draganov to verify intersections and non-intersections with neighboring streets. The top was down.

Security restrictions:
No security restrictions.

Update Frequency:
No scheduled updates--changes to the damaged Cypress freeway are not captured.

Update process:
The new Cypress Structure will be updated when accurate coordinates are available.